Load Specifications
Load data in caliber .378 Weath. Mag. with .375 | 260gr | Nosler Solid bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 57,464 psi | 90% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,159 psi | 88% | 2871 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2969 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 54,404 psi | 85% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,390 psi | 87% | 2959 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3061 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 86% | 57,711 psi | 90% | 2930 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,159 psi | 88% | 3009 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3064 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,072 psi | 58% | 2713 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,450 psi | 90% | 3061 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,129 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,259 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,985 psi | 88% | 3015 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,537 psi | 90% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,550 psi | 87% | 2995 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3058 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 2982 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,615 psi | 73% | 2920 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,853 psi | 84% | 3071 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2982 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 56,072 psi | 88% | 2917 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3058 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 55,288 psi | 87% | 2907 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 56,347 psi | 88% | 2940 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,984 psi | 86% | 2979 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 55,303 psi | 87% | 2946 fps | 99% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2930 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,507 psi | 89% | 2986 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,347 psi | 88% | 2933 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,346 psi | 85% | 2920 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,629 psi | 72% | 2959 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 88% | 53,838 psi | 84% | 2995 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 57% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,188 psi | 90% | 2917 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,710 psi | 89% | 2884 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,666 psi | 89% | 2904 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,259 psi | 87% | 2884 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 56,463 psi | 88% | 2946 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,927 psi | 89% | 2933 fps | 99.7% |
| IMR 4831 | <<locked>> | 96% | 56,782 psi | 89% | 2966 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,681 psi | 89% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,477 psi | 87% | 2933 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 98% | 55,361 psi | 87% | 3041 fps | 98% |
| Lovex S062 | <<locked>> | 84% | 57,406 psi | 90% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,145 psi | 90% | 2930 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,056 psi | 86% | 2923 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,471 psi | 74% | 2818 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 54,592 psi | 86% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,406 psi | 90% | 3002 fps | 98.9% |
| Norma MRP | <<locked>> | 98% | 56,492 psi | 89% | 3087 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 57,551 psi | 90% | 2995 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,376 psi | 87% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,245 psi | 87% | 3051 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 92% | 56,376 psi | 88% | 3002 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,101 psi | 88% | 3028 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,231 psi | 88% | 2923 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,884 psi | 89% | 3028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,230 psi | 87% | 2982 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,377 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,672 psi | 72% | 2956 fps | 99% |
| Rottweil R 902 | <<locked>> | 82% | 55,811 psi | 87% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,289 psi | 88% | 2917 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,317 psi | 85% | 2923 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 96% | 54,897 psi | 86% | 2982 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 88% | 55,288 psi | 87% | 2907 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,145 psi | 90% | 2930 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,406 psi | 90% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,056 psi | 86% | 2923 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,070 psi | 85% | 2923 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,898 psi | 89% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,782 psi | 89% | 2884 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,433 psi | 85% | 2979 fps | 98.8% |
| Somchem S355 | <<locked>> | 86% | 56,028 psi | 88% | 2910 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,883 psi | 88% | 2913 fps | 97.3% |
| Somchem S365 | <<locked>> | 94% | 57,232 psi | 90% | 2995 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,550 psi | 87% | 2956 fps | 99.4% |
| Unknown powder | <<locked>> | 88% | 54,534 psi | 85% | 2949 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 56,289 psi | 88% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,420 psi | 88% | 2835 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,450 psi | 90% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,043 psi | 88% | 2936 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,882 psi | 86% | 2930 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 82% | 54,636 psi | 86% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,158 psi | 86% | 2943 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,275 psi | 88% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,608 psi | 89% | 3077 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 2923 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,622 psi | 87% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,984 psi | 86% | 2979 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,313 psi | 77% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,638 psi | 90% | 2982 fps | 99.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 53,896 psi | 84% | 2785 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,195 psi | 72% | 2707 fps | 97.9% |
| Accurate 3100 | <<locked>> | 82% | 30,995 psi | 49% | 2464 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 51,082 psi | 80% | 2795 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,334 psi | 62% | 2677 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 98% | 52,417 psi | 82% | 3002 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,008 psi | 75% | 2776 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,538 psi | 64% | 2717 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 92% | 44,019 psi | 69% | 2815 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 98% | 34,780 psi | 55% | 2651 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,461 psi | 84% | 2999 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,646 psi | 76% | 2799 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,938 psi | 81% | 2871 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,116 psi | 60% | 2690 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,381 psi | 68% | 2812 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,248 psi | 63% | 2710 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,985 psi | 60% | 2703 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,992 psi | 44% | 2441 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,778 psi | 50% | 2566 fps | 96% |
| Alliant Reloder-26 | 96.3 gr | 80% | 29,979 psi | 47% | 2556 fps | 96.1% |
| Bofors RP15 | <<locked>> | 92% | 40,089 psi | 63% | 2749 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 49,211 psi | 77% | 2815 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 37,985 psi | 60% | 2703 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 43,047 psi | 67% | 2687 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 80% | 49,356 psi | 77% | 2825 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,802 psi | 70% | 2799 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 40,437 psi | 63% | 2667 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 96% | 46,717 psi | 73% | 2818 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,151 psi | 72% | 2808 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,708 psi | 56% | 2575 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,821 psi | 80% | 2867 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,521 psi | 59% | 2762 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 40,089 psi | 63% | 2736 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,369 psi | 43% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,633 psi | 79% | 2818 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,287 psi | 84% | 2835 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,108 psi | 74% | 2753 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,166 psi | 72% | 2726 fps | 98.5% |
| IMR 4350 | <<locked>> | 80% | 38,667 psi | 61% | 2615 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,425 psi | 70% | 2717 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 34,243 psi | 54% | 2546 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 53,272 psi | 83% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,977 psi | 72% | 2766 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 45,107 psi | 71% | 2854 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 50,836 psi | 80% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,974 psi | 66% | 2667 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 40,248 psi | 63% | 2651 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 32,329 psi | 51% | 2500 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 51,271 psi | 80% | 2858 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,857 psi | 64% | 2703 fps | 95.5% |
| Norma MRP | 98.2 gr | 84% | 34,722 psi | 54% | 2654 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 38,943 psi | 61% | 2671 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 51,735 psi | 81% | 2881 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 44,222 psi | 69% | 2848 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 37,782 psi | 59% | 2657 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 90% | 38,377 psi | 60% | 2700 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 44% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,342 psi | 77% | 2812 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,079 psi | 72% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,102 psi | 61% | 2697 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,724 psi | 59% | 2703 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,985 psi | 58% | 2746 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 52,605 psi | 82% | 2815 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,267 psi | 73% | 2759 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,875 psi | 70% | 2753 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 86% | 39,421 psi | 62% | 2694 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 43,047 psi | 67% | 2687 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,974 psi | 66% | 2667 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 50,836 psi | 80% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,248 psi | 63% | 2651 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,427 psi | 74% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,282 psi | 74% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,118 psi | 64% | 2612 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,059 psi | 61% | 2687 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 46,441 psi | 73% | 2756 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,905 psi | 72% | 2743 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 35,476 psi | 56% | 2628 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 37,521 psi | 59% | 2621 fps | 95.8% |
| Unknown powder | <<locked>> | 80% | 41,901 psi | 66% | 2726 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 80% | 52,924 psi | 83% | 2772 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,011 psi | 83% | 2785 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,411 psi | 70% | 2684 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,364 psi | 63% | 2667 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 36,970 psi | 58% | 2602 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 51,256 psi | 80% | 2782 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,769 psi | 62% | 2667 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 31,082 psi | 49% | 2520 fps | 97.6% |
| Vihtavuori N560 | 107.5 gr | 92% | 46,122 psi | 72% | 2887 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 98% | 45,266 psi | 71% | 2861 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,407 psi | 62% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,802 psi | 70% | 2799 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,787 psi | 39% | 2421 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,132 psi | 63% | 2674 fps | 95.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 93 powders for .378 Weath. Mag. loaded with the .375 | 260gr | Nosler Solid. Norma MRP delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,087 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 260.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .378 Weath. Mag. with the .375 | 260gr | Nosler Solid they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.